CN2672676Y - Digital camera lens module - Google Patents

Abstract

The utility model discloses a digital camera lens module, comprising a lens module, a reflexion unit, and an optical receiver, wherein, the lens module and the optical receiver are arranged side by side, the reflexion unit is provided under the lens module and the optical receiver, and the reflexion unit reflects the light emitted from the lens module to the optical receiver. Compared with the exsiting digital camera lens module that each component displays simply linearly, adopting the structure can decrease the thickness of digital camera lens module and the optical aberration of image-forming.

Description

Digital Camera Lens Module

【Technical field】

The utility model relates to a digital camera lens module, in particular to a digital camera lens module used in portable electronic devices.

【Background technique】

At present, with the significant improvement of CPU (Central Processing Unit, central processing unit) performance and the rapid development of image processing technology, electronic devices such as mobile phones, PDA (Personal Digital Assistant, personal digital assistant) and computers have high The ability of digital image processing has led to the rapid development of digital camera lens modules as image capture devices. With the miniaturization trend of portable electronic devices such as mobile phones and PDAs, the overall thickness of the digital camera lens module is also required to be improved.

Users generally hope that the lens zoom range of their portable electronic devices that can take pictures should be as wide as possible. A zoomable digital camera module usually uses several lenses to form an optical lens system. When shooting, the optical system is changed by changing the distance between the lenses. The focal length to achieve the purpose of zooming. As shown in Figure 1, the existing digital camera lens module mainly includes a lens module 10 (such as an aspheric lens group), an optical filter 20, and a light receiving device 40CMOS ((Complementary Metal Oxide Semiconductor, Complementary Metal Oxide Semiconductor) Or CCD (Charge Coupled Device, Charge Coupled Device sensor)) and printed circuit board 50, wherein the lens module 10 is used to gather light, so that the light reaching the light receiving device 40 has a higher light intensity. The filter 20 can filter out part of the incident light, so that the imaging effect is better. The light receiving device 40 converts the light signal passing through the optical filter 20 into an electrical signal, and the printed circuit board 50 processes the electrical signal generated by the light receiving device 40 . The existing digital camera lens module is designed with a simple linear optical path, and the light receiving device 40 is located at the focal length of the lens module 10 to achieve the best imaging effect. Although this kind of design expands the range of the focal length of the lens, it increases the length and weight of the lens, which is not convenient for application in portable electronic devices. In order to reduce the thickness of the camera module, it is necessary to make a special design for the lens module 10 and increase the difficulty.

Therefore, to provide a digital camera lens module implementation that can reduce the thickness of the digital camera lens module by changing the direction of the optical path through the reflection device to change the direction of the optical path, thereby reducing the thickness of the digital camera lens module, and using diffractive optical design to reduce imaging aberrations. as necessary.

【Content of invention】

The purpose of this utility model is to provide a digital camera that can change the direction of the light path by changing the turning direction of the light path through the reflection device, so that the overall light path can be elongated, thereby reducing the thickness of the lens module of the digital camera, and using the diffractive optical design to reduce the imaging aberration Lens module.

In order to achieve the purpose of the utility model, the utility model provides a digital camera lens module, including a lens module, a reflection device and a light receiving device, wherein the lens module and the light receiving device are located on the same side of the reflection device, and the lens module The optical signal transmitted by the group is incident to the light receiving device after being reflected by the reflecting device.

Compared with the simple linear arrangement of the components of the existing digital camera lens module, the lens module of the digital camera lens module of the present invention changes the direction of the optical path through the turning of the reflection device, which lengthens the overall optical path, and There is no need for special design of the lens module, thereby reducing the difficulty of lens module design, and the structural arrangement is more flexible; and one side of the reflection device is an aspheric surface, thereby shortening the distance between the lens module and the light receiving device, making digital The thickness of the camera lens module is reduced; in addition, the lens module is a diffractive optical lens, which can reduce the imaging aberration correspondingly while ensuring the imaging effect.

【Description of drawings】

FIG. 1 is a schematic structural diagram of an existing digital camera lens module.

Fig. 2 is a schematic structural view of the digital camera lens module of the present invention.

【Detailed ways】

As shown in Figure 2, the digital camera lens module of the present utility model comprises a lens module 1, an infrared cut-off filter film 2, a reflection device 3, a light receiving device 4 (in this embodiment, a CMOS sensor or a CCD sensor) and a printing circuit board 5.

The lens module 1 can be designed to be integrally formed with the reflection device 3, which includes a diffractive curved surface 10 and an aspheric curved surface 12. The diffractive curved surface 10 can be a grating, which can be made by photoetching or holographic method for correcting aberrations.

The printed circuit board 5 is located above the light receiving device 4 and electrically connected to the light receiving device 4 , and the printed circuit board 5 and the light receiving device 4 are arranged side by side with the lens module 1 . The reflection device 3 is located below the lens module 1 and the light receiving device 4 , and reflects the incident light from the lens module 1 into the light receiving device 4 .

The reflective device 3 is a trapezoidal prism with a reflective film, which includes a top surface 31 , a left side 32 and a right side 33 . The reflective device 3 is approximately parallel to the lens module 1 . Wherein, the left side 32 is opposite to the lens module 1 , and the right side 33 is an aspheric curved surface, which is opposite to the light receiving device 4 . The infrared cut-off filter film 2 is coated on the top surface 31 , and the left side 32 and the right side 33 are coated with a first total reflection film 321 and a second total reflection film 331 on their outer surfaces respectively.

When in use, after the light of the target scene is converged by the lens module 1, it passes through the infrared cut-off filter film 2, and is totally reflected to the second total reflection film after passing through the first total reflection film 321 on the left side 32 of the reflection device 3 331, and then shoot to the top surface 31 after total reflection by the second total reflection film 331, and the infrared cut-off filter film 2 on the top surface 31 can prevent the infrared rays of the incident light from passing through, thereby avoiding noise due to infrared interference during normal shooting , therefore, to ensure that the image color reproduction is more accurate. Then the light is transmitted to the light receiving device 4, and the light receiving device 4 converts the received light signal into an electrical signal, and after being processed by the printed circuit board 5, the digital image signal of the target scene is obtained. After passing through the two total reflection films, the direction of the light path of the incident light is roughly changed by 180 degrees, thereby reducing the overall thickness of the digital camera.

It can be understood that the reflector 3 of the digital camera lens module of the present invention is not only limited to the trapezoidal prism, in order to reflect the light transmitted from the lens module 1 to the light receiving device 4, a plane mirror, or other It can be realized by a reflective device that reflects light. In order to obtain the best imaging effect of the camera module, the lens module 1 , the light receiving device 4 and the reflecting device 3 may form a certain angle with each other.

Claims (10)

1. digital camera lens module, comprise lens module, reflection unit, printed circuit board (PCB) and optical pickup apparatus, it is characterized in that: this lens module is provided with diffraction optical assembly, this optical pickup apparatus and lens module are positioned at the homonymy of reflection unit, are incident to optical pickup apparatus through the light signal that the lens module transmits after the reflection unit reflection.

2. as 1 described digital camera lens module of claim the, wherein, described reflection unit is a Dove prism, and it comprises at least one non-spherical surface.

3. as 1 described digital camera lens module of claim the, wherein, described diffraction optical assembly is a grating, and this grating comprises diffraction curved surface and non-spherical surface.

4. as 1 described digital camera lens module of claim the, wherein, this digital camera lens module further comprises infrared cut-off light filtering films, between lens module and reflection unit.

5. as 2 described digital camera lens modules of claim the, wherein this Dove prism comprises left surface, right flank and end face, and left surface is relative with the lens module, and right flank is a non-spherical surface, and it is relative with optical pickup apparatus.

6. as 5 described digital camera lens modules of claim the, wherein, described infrared cut-off light filtering films is plated in the end face of reflection unit.

7. as 5 described digital camera lens modules of claim the, wherein, the left surface of described reflection unit and right flank are coated with total reflection film at its outside surface respectively.

8. as 1 described digital camera lens module of claim the, wherein, described lens module and optical pickup apparatus are arranged side by side.

9. as 1 described digital camera lens module of claim the, wherein, described lens module and reflection unit be arranged in parallel.

10. as 1 described digital camera lens module of claim the, wherein, described optical pickup apparatus is a cmos sensor.

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